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Scenedesmus spp. - colonial green alga

Image Number: 251196F

Caption:

Scenedesmus spp. - flat colony of 4 alga cells. Scenedesmus, a green alga from the Chlorophyceae group, is a small, nonmotile, colonial green alga consisting of cells aligned in a flat plate. The colonies most often have two or four cells, but may have 8, 16, or 32 cells. The cells are usually cylindrical but may be more lunate (crescent-shaped), ovoid, or fusiform (wide in the middle and tapering at both ends). Often the end cells each have two long spines protruding from their outer corners (example: Scenedesmus quadricauda). Other cells may have additional spines or chitinous bristles. Each cell contains a single parietal, plate-like chloroplast with a pyrenoid (the site of CO2 fixation). The cell walls may be covered in bumps or reticulations. Scenedesmus is a photosynthetic planktonic organism that is important in the aquatic food chain.

Keywords:

| 251196F algae alga green algae Kaiwanui marsh Hawaii Scenedesmus 05.01.08 Hawaiian alga alga colony algae colony Chlorophyceae colonial alga colonial algae green alga green alga colony green algae colony colonial green alga colonial green algae food chain fresh water plankton photosynthetic plankton plankton planktonic chitin chitinous chitinous bristle chitinous bristles aquatic food chain Chlorophyta chlorophyte Algae algal colony chlorophyte colonies daughter colonies daughter colony eukaryote fresh water alga fresh water algae fresh water colony fresh water flagellate fresh water phytoplankton freshwater SEM |

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